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Comparison of aromatic TROSY spectra (Meissner and Sorensen 1999) using one or three constant time evolution periods of uniformly 13C labeled, 2-13C pyruvate, and 3-13C pyruvate labeled Bcl-xL. The region contains Phe and Tyr δ signals. While the uniformly 13C labeled sample lost most signals after three CT periods, the signals remain very strong with alternate labeling and are sharper due to extensive sampling.
